issue with sum in for loop

Hi, I have the following for loop:

       for p=2:256
            diff=abs(((counts2(p,2))-(counts2(p-1,2)))/(p+1-p));
            disp(diff);
            histsum=histsum+diff;
            disp(histsum);
        end

the diff is being calculated correctly but the histsum is not being calculated. It is empty hence nothing is returned for the line disp(histsum).it has been added as a variable and is initialized. Any thoughts on why this could be so and how to fix it are welcome.

thanks

Answer 1

[Matt J]

Works fine for me. Make sure you didn't initialize as

   histsum=[]

[Ram]

Thanks, Matt, I had initialized it incorrectly.